Footwear upper with dynamic and lock-out regions

ABSTRACT

An article of apparel includes a base layer and an auxetic layer coupled to the base layer. The auxetic layer includes an auxetic structure defining a repeating pattern of shapes, with each of the shapes defined by perimeter walls and an interior recess. The auxetic layer includes a first region and a second region. Each interior recess in the first region provides a void exposing the base layer, and each interior recess in the second region is at least partially filled with a recess material.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority from U.S. Provisional PatentApplication No. 62/296,190, filed Feb. 17, 2016, and is acontinuation-in-part of U.S. application Ser. No. 15/386,975, filed Dec.21, 2016, which is a continuation of U.S. application Ser. No.14/137,038, filed Dec. 20, 2013, which is a continuation-in-part of U.S.application Ser. No. 13/838,827, filed Mar. 15, 2013, which claimspriority from U.S. Provisional Patent Application No. 61/695,993, filedAug. 31, 2012. The disclosure of each of the aforementioned applicationsis incorporated herein by reference in its entirety.

FIELD

This document relates to the field of apparel, including footwear, andstructures for incorporation into the articles of apparel.

BACKGROUND

Many garments and other articles of apparel are designed to fit closelyto the human body. When designing an article of apparel for a close fitto the human body, different body shapes and sizes must be considered.Different individuals within a particular garment size will havedifferent body shapes and sizes. For example, two individuals wearingthe same shoe size may have very differently shaped feet, including verydifferent heel, midfoot and forefoot dimensions. These variablemeasurements between similarly sized individuals makes proper design ofclosely fitting garments difficult.

In addition to accounting for different body measurements for differentindividuals within a size, various contours of the human body must alsobe considered when designing closely fitting articles of apparel. Thesecontours of the human body often include various double curvaturesurfaces. Spheroids, bowls, and saddle-backs are all examples ofsurfaces having double curvatures. If an article of apparel is notproperly sized for a particular wearer, the wearer may experienceundesirable tightness or looseness at various locations. Such animproper fit may result in discomfort, excessive wear, buckling, bendingor creasing of the garment at the poorly fitting locations.

Another consideration when designing articles of apparel is the stress,strain and other forces that will be applied to particular regions ofthe article of apparel, depending upon the use of the article ofapparel. For example, a shoe that is used for cross training purposeswill experience forces that are significantly different from a shoe thatis used exclusively for running. Thus, it is difficult to design a shoeor other article of apparel that offers good performance characteristicswhen used for various different purposes.

The contour and fit of a particular of apparel may be furthercomplicated by coupling arrangements such as lacing arrangements,zippers, and buttons which draw opposing seams toward one another andcouple them together. In particular, because fastening arrangements drawtwo opposing sides together, there is often buckling and creasing in thearea of the fastening arrangement when the sides are drawn together, andthis can lead to discomfort and undesirable tightness to the wearer.

In view of the foregoing, it would be desirable to provide a shoe orother article of apparel capable of conforming to various foot or bodyshapes within a given size range. It would also be desirable to providea shoe or other article of apparel that is capable of conforming tovarious double curvatures on the human body and generally providing agood fit. Furthermore, it would be advantageous if such a shoe or otherarticle of apparel could be designed to offer good performancecharacteristics for multiple uses, such as a cross-training shoe thatoffer good performance characteristics when the shoe is used for any ofa number of different athletic training purposes. Also, it would beadvantageous to provide a shoe including a fastening arrangement adaptedto reduce buckling and discomfort to a wearer when the fasteningarrangement is drawn together. In addition, it would be desirable forsuch a garment or article of apparel to be relatively inexpensive andeasy to manufacture.

SUMMARY

An article of footwear includes an upper with a functional laminateincluding a textile layer and a polymer layer. The textile layerpossesses a first expansion (stretch) pattern, while the polymer layerpossesses a second expansion pattern. The functional laminate isconfigured such that, under load, the polymer layer dominates thestructure expansion pattern of the textile layer to control expansion ofthe structure. The textile layer, furthermore, dominates the polymerlayer upon removal of the load to drive retraction of the structure. Inan embodiment, the polymer layer is defined by a plurality of open andclosed cells operable to create localized expansion patterns along theupper.

In accordance with one exemplary embodiment of the disclosure, there isprovided an article of apparel comprising a base layer and an auxeticlayer coupled to the base layer. The auxetic layer comprises an auxeticstructure defining a repeating pattern of shapes, each of the shapes isdefined by perimeter walls and an interior recess. The auxetic layerincludes a first region and a second region, wherein each interiorrecess in the first region provides a void exposing the base layer, andwherein each interior recess in the second region is at least partiallyfilled with a recess material.

In accordance with another exemplary embodiment of the disclosure, thereis provided an article of apparel comprising a base layer and an auxeticstructure coupled to the base layer. The auxetic structure includes aplurality of interconnected members forming an array of cell units. Eachof the plurality of interconnected members forms cell walls withinterior recesses defined within the cell walls. The array of cell unitsincludes at least one dynamic region wherein the interior recessesexpose the base layer and at least one lockout region wherein a fill inthe interior recesses covers the base layer.

In accordance with yet another exemplary embodiment of the disclosure,there is provided an article of footwear including a sole and an upperconnected to the sole. The upper includes a base layer and an auxeticlayer connected to the base layer. The auxetic layer includes an auxeticstructure defining a repeating pattern of shapes, each of the shapesdefined by perimeter walls with an interior recess provided within eachshape. The auxetic structure further includes a first region and asecond region. Each interior recess in the first region provides a voidexposing the base layer. Each interior recess in the second region is atleast partially filled with a recess material.

The above described features and advantages, as well as others, willbecome more readily apparent to those of ordinary skill in the art byreference to the following detailed description and accompanyingdrawings. While it would be desirable to provide an article of apparelthat provides one or more of these or other advantageous features, theteachings disclosed herein extend to those embodiments which fall withinthe scope of the appended claims, regardless of whether they accomplishone or more of the above-mentioned advantages.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a side view of an article of footwear in accordance with anembodiment of the present invention;

FIG. 1B is a rear perspective view of the article of footwear of FIG. 1;

FIG. 1C is a top plan view of the article of footwear of FIG. 1;

FIG. 1D is a front view in elevation of the article of footwear of FIG.1;

FIG. 1E is a rear view in elevation of the article of footwear of FIG.1;

FIG. 1F is a bottom plan view of the article of footwear of FIG. 1;

FIG. 2A shows an enlarged plan view of an auxetic panel including anauxetic layer forming a plurality of reentrant shapes;

FIG. 2B shows a cross-sectional view of the auxetic panel of FIG. 2Aalong line B-B of FIG. 2A;

FIG. 2C shows a cross-sectional view of the auxetic panel of FIG. 2Aalong line C-C of FIG. 2A;

FIG. 3A shows an alternative embodiment of the auxetic panel of FIG. 2A;

FIG. 3B shows an enlarged, schematic view of an auxetic layer of theauxetic panel of FIG. 4A, showing exemplary dimensions of theinterconnected segments of the auxetic layer;

FIG. 3C shows a cross-sectional view of the auxetic panel of FIG. 3A;

FIG. 4A shows a plan view of an auxetic layer of the auxetic panel ofFIG. 3A in a contracted position;

FIG. 4B shows a plan view of the auxetic layer of FIG. 4A in an expandedposition;

FIG. 5 shows a perspective view of an alternative embodiment of thearticle of footwear of FIGS. 1A-1F, the auxetic panel including dynamicregions and lockout regions;

FIG. 6 shows an enlarged top view of a forefoot region of the article offootwear of FIG. 5;

FIG. 7A shows an enlarged plan view of an auxetic panel provided on thearticle of footwear of FIG. 5;

FIG. 7B shows a cross-sectional view of the auxetic panel of FIG. 7Aalong line B-B of FIG. 7A;

FIG. 8A shows a top view of a vamp panel for an alternative embodimentof the article of footwear of FIG. 5;

FIG. 8B shows a bottom view of the vamp panel of FIG. 8A;

FIG. 9A shows a plan view of an alternative embodiment of the vamp panelof FIG. 8A;

FIG. 9B shows a cross-sectional view of the vamp panel along line B-B ofFIG. 9A; and

FIG. 9C shows a cross-sectional view of the vamp panel along line C-C ofFIG. 9A.

Like reference numerals have been used to identify like elementsthroughout this disclosure.

DESCRIPTION

With reference to FIGS. 1A-2B, an article of apparel is shown in theform of an article of footwear 10. Referring to FIGS. 1A-1F, the articleof footwear 10 is an athletic shoe (e.g., a cross-training shoe)including an upper 100 coupled to a sole assembly 105 (e.g., connectedvia an adhesive, stitching, etc.). The article of footwear 10 defines aforefoot region 110A, a midfoot region 110B, and a hindfoot region 110C,as well as a medial side 115A and a lateral side 115B. The forefootregion 110A is configured to align generally with (be positionedproximate to) the ball and toes of the foot, the midfoot region 110B isconfigured to align generally with the arch and instep areas of thefoot, and the hindfoot region 110C is configured to align generally withthe heel and ankle areas of the foot. Additionally, the medial side 115Ais oriented along the medial (big toe) side of the foot, while thelateral side 115B is oriented along the lateral (little toe) side of thefoot.

The upper 100 includes a plurality of sections that cooperate to definea foot cavity. Specifically, a heel section 121 includes heel cupconfigured to align with and cover the calcaneus area of a human foot. Alateral quarter section 130A, disposed forward the heel section 121, isoriented on the lateral shoe side 115B. Similarly, a medial quartersection 130B, disposed forward the heel section 121, is oriented on themedial shoe side 115A. A vamp section 136 is disposed forward thequarter sections 130A, 130B and a toe cage section 141 is disposedforward the vamp section. The upper 100 may further include tongue 132disposed within a tongue slot 131 configured to align with and span theinstep area of the foot.

The sole assembly 105 typically includes an insole (not shown), amidsole 106, and an outsole 108, which together cushion and protect theuser's foot while the user makes contact with the ground. The soleassembly may be a conventional sole assembly, or, as illustrated, mayinclude a mechanical cushioning system as disclosed in U.S. applicationSer. No. 15/149,661, the disclosure of which is incorporated herein byreference in its entirety.

With this configuration, the heel 121, lateral quarter 130A, medialquarter 130B, vamp 136, toe cage 141, and tongue 132 cooperate with thesole assembly 105 to define a foot cavity into which a human foot isinserted by way of an access opening 155 bounded by a collar 157. Thefoot may be secured within the cavity utilizing a fastening device 159such as a lacing system, a cable system, a hook and loop fastener, etc.

Functional Laminate

All or part of the upper is formed from a functional laminate having apredetermined expansion pattern. The functional laminate includes baseor textile layer and a polymer layer coupled (e.g., connected, mounted,laminated, etc.) to the textile layer. The textile layer includes aplurality of strands interconnected via weaving, kitting, braiding, orvia a nonwoven process. The strands forming the textile may be anynatural or synthetic strands suitable for their described purpose. Theterm “strand” includes one or more filaments organized into a fiberand/or an ordered assemblage of textile fibers having a high ratio oflength to diameter and normally used as a unit (e.g., slivers, roving,single yarns, plies yarns, cords, braids, ropes, etc.). In a preferredembodiment, a strand is a yarn, i.e., textile fibers or filamentsintertwined in a form suitable for knitting, weaving, or otherwiseintertwining to form a textile fabric. A yarn may include a number offibers twisted together (spun yarn); a number of filaments laid togetherwithout twist (a zero-twist yarn); a number of filaments laid togetherwith a degree of twist; and a single filament with or without twist (amonofilament).

The strands, furthermore, may include elastic strands and/or aninelastic strands. An elastic strand is formed of elastomeric material;accordingly, it possesses the ability to stretch and recover by virtueof its composition. A specific example of an elastomeric materialsuitable for forming an elastic strand is an elastomericpolyester-polyurethane copolymer such as elastane, which is amanufactured fiber in which the fiber-forming substance is a long chainsynthetic polymer composed of at least 85% of segmented polyurethane. Incontrast, an inelastic is formed of a non-elastomeric material.Accordingly, by virtue of its composition, inelastic strands possess noinherent stretch and/or recovery properties. Hard yarns are examples ofinelastic strands. Hard yarns include natural and/or synthetic spunstaple yarns, natural and/or synthetic continuous filament yarns, and/orcombinations thereof. By way of specific example, natural fibers includecellulosic fibers (e.g., cotton, bamboo) and protein fibers (e.g., wool,silk, and soybean). Synthetic fibers include polyester fibers(poly(ethylene terephthalate) fibers and poly(trimethyleneterephthalate) fibers), polycaprolactam fibers, poly(hexamethyleneadipamide) fibers, acrylic fibers, acetate fibers, rayon fibers, nylonfibers and combinations thereof.

It should be noted that an inelastic strand may be modified to possess atopology that enables the strand to provide mechanical stretch andrecovery within the textile structure. For example, a hard yarn may betexturized (e.g., crimped) to generate stretch within the yarn.

Preferably, the textile layer is a resilient layer possessing stretchand recovery properties. That is, the textile structure possesses theability to expand from its original shape/dimensions (stretch), as wellas to contract, returning to its original shape/dimensions (recover).Accordingly, the textile layer expands when a tension is placed on thetextile (e.g., along the machine direction and/or along the non-machinedirection). The stretch of the textile may be directional. For example,the textile may possess four-way or two-way stretch capabilities. Atextile with “four way” stretch capabilities stretches in a firstdirection and a second, directly-opposing direction, as well as in athird direction that is perpendicular to the first direction and afourth direction that is directly opposite the third direction. In otherwords, a sheet of four-way stretch material stretches in both crosswiseand lengthwise. A material with “two way” stretch capabilities, incontrast, stretches to some substantial degree in the first directionand the second, directly opposing direction, but will not stretch in thethird and fourth directions, or will only stretch to some limited degreein the third and fourth directions relative to the first and seconddirections (i.e., the fabric will stretch substantially less in thethird and fourth directions than in the first direction and seconddirections). In other words, a sheet of two-way stretch materialstretches either crosswise or lengthwise.

Regardless of the direction of the stretch, during expansion, thetextile will possess an expansion pattern. Specifically, textilesgenerally exhibit a strongly positive Poisson ratio. Thus, when a loador tension is applied to textile (along an axis), the normal stretchpattern causes the textile to constrict along the axis that isperpendicular to the load axis. Stated another way, the expansionpattern of the textile layer is anticlastic, contracting in thedirections transverse to the direction of stretching. Upon release ofthe tension/load, the recovery power of textile returns the fabric toits original shape/dimensions.

The polymer layer is formed of a flexible, elastomeric polymer such asthermoplastic polyurethane or rubber (foamed or non-foamed). The polymerlayer is applied to the textile layer such that any movement of thepolymer layer generates movement in the textile layer, and vice versa.By way of example, the polymer layer may be directly applied to thetextile in a liquid or gelatinous state such that the polymerinfiltrates the textile, flowing between the strands. By way of example,the layer may be applied via flow molding. By way of further example,the polymer layer may be applied via screen printing (e.g., threedimensional screen printing) or an additive manufacturing process (3Dprinting techniques). In other embodiments, the polymer may be appliedin non-solid form and cured. In still other embodiments, the polymerlayer is formed separately (e.g., via selective lasersintering/ablation) and is adhered to the base layer via, e.g., anadhesive, welding, etc.

The polymer layer includes a plurality of cells or substructuresarranged in an array. The cells are polygons including one or moreinternal angles that are reflexive (possessing a value between180°-360°). In other words, the cells are reentrant polygons. Individualcells may be open cells or closed cells. Open cells have a central voidthat exposes the textile layer. Closed cells lack a void, i.e., materialspans the cell to cover the textile layer. With this configuration, theopen cells will expand under load, changing its shape to increase insize/dimensions. The closed cells either open to a lesser extent or notall. In this manner, dynamic regions and lockout regions can be definedwithin the upper, controlling its expansion pattern (discussed ingreater detail below).

The cell array is a unitary (one piece or monolithic) structure ofinterconnected cells, with a cell sharing common borders with adjacentcells. Specifically, the plurality of cells forming the array isorganized in a series of columns. In some embodiments (FIG. 2A), thecells of adjacent columns are oriented in opposite directions. In otherembodiments (FIG. 3A), the cells of adjacent columns are oriented alongthe same direction, but are longitudinally offset such that cells of afirst column are staggered relative to the cells of a second, adjacentcolumn. By way of example, the upper end of one cell is orientedproximate the longitudinal center (equator) of its adjacent cell. Witheither configuration, the cell array is configured such that movement ofone cell generates movement in an adjacent cell.

The expansion pattern of the polymer layer differs from the expansionpattern of the textile layer. For example, while the normal stretchpattern of the textile layer is to constrict along the axis that isperpendicular to the load axis, the polymer layer (or portions thereof)may either resist constriction or expand along the axis perpendicular tothe load axis. For example, the polymer layer may be synclastic orauxetic, exhibiting a negative Poisson's ratio.

The polymer is coupled (e.g., mounted) onto the textile layer to formthe textile laminate, with the textile layer being generally coextensivewith the textile layer. In areas including open cells, the polymer layeris discontinuous. In areas including closed cells, the polymer layer iscontinuous. The polymer layer, moreover, is configured to control thetextile layer during expansion, altering the expansion pattern of thefabric in areas including the open and/or closed cells. That is, duringexpansion of the functional laminate, the power of the polymer layer isgenerally stronger than the power of the textile layer; consequently,the expansion pattern of the polymer layer dominates the expansionpattern of the textile layer. Accordingly, the polymer layer drives theexpansion of the textile layer in a predetermined pattern that differsfrom the textile layer's native expansion pattern to that of the polymerlayer. With this configuration, the open cells may define dynamicregions, altering the expansion layer of the textile layer to a firstdegree, while the closed cells may define lockout regions, altering theexpansion pattern of the textile layer to a second (different) degree(discussed in greater detail below).

Accordingly, when coupled to the textile layer, the polymer layer (thecell array) may work to resist deformation and shrinkage in the textilelayer. Specifically, the polymer layer is configured to lower thePoisson ratio of the fabric, making the ratio of the functional laminate(the combined structure textile layer/polymer layer structure) lesspositive. In some embodiments, the Poisson ratio of the resultingfunctional laminate is less strongly positive. In other embodiments, itis zero; in others, it the Poisson ratio is negative. For example, thefunctional laminate (or portions thereof) may possess a negativePoisson's ratio, generating a synclastic or auxetic expansion pattern inwhich the function laminate expands along the axis perpendicular to theload axis (expands in directions transverse to the direction ofstretching).

The textile layer, however, may possess greater recovery power than thepolymer layer. Accordingly, upon removal of the load along the loadaxis, the textile layer dominates, drawing the polymer layer back to itscontracted configuration. In this manner, each layer plays a role in thecombined structure, driving expansion or contraction behavior of thelaminate.

EXAMPLES

Referring the embodiment of FIG. 2A, an enlarged view of the functionallaminate 118 is shown. The functional laminate 118 includes the polymeror auxetic layer 120 and the textile or base layer 122. The auxeticlayer 120 is connected to the base layer 122 and is generally arrangedabove or outwardly from the base layer 122. Accordingly, the outersurface of the auxetic layer 120 is exposed on the exterior of the upper100, and an inner surface of the base layer 122 faces inwardly towardthe foot cavity. For clarity in FIG. 2A, the base layer 122 is shown asthe cross-hatched portion under the auxetic layer 120 which does notinclude any cross-hatching. Therefore, it will be recognized that thecross-hatching in FIG. 2A is for purposes of contrast only, and does notindicate any cross-section or particular material.

As indicated above, the auxetic layer 120 includes an auxetic structureprovided by a plurality of interconnected segments 126 arranged in amanner to provide a repeating pattern of reentrant shapes (i.e., concavepolygons). In the embodiment of FIG. 2A, the repeating pattern ofreentrant shapes is an array of reentrant shapes which may be consideredto exist in rows and columns of the auxetic structure. Theinterconnected segments 126 form the reentrant shapes in the auxeticstructure, and an interior recess 128 is defined within each reentrantshape. In the embodiment of FIGS. 2A-2C, each interior recess 128 isgenerally void of material such that the base layer 122 is exposed on anouter side of the auxetic panel 118 through the internal recesses 128.

The reentrant shapes formed by the interconnected segments 126 may beany of various shapes capable of providing an auxetic structure. In theembodiment of FIGS. 2A-2C, the reentrant shapes formed by theinterconnected segments are arrowhead shapes (which may also be referredto herein as “chevron” shapes). Segments 126 a-126 d in FIG. 2Aillustrate a group of interconnected segments that form an arrowheadshape. Segments 126 a and 126 b are connected at a leading vertex 127 aand form a first acute interior angle for the reentrant shape. Segments126 a and 126 c are connected at a first trailing vertex 127 b and forma second acute interior angle. Segments 126 b and 126 d are connected ata second trailing vertex 127 c and form a third acute interior angle.Segments 126 c and 126 d are connected at a concave portion of thereentrant shape and form a reflexive interior angle.

Together, each set of interconnected segments 126 forming a reentrantshape and the associated interior recess 128 forms a cell unit 124. Forexample, in FIG. 2A, segments 126 a-d and interior recess 128 a formscell unit 124 a. While each cell unit has a unique interior recess 128,cell units may share the same segment 126. In other words, each segment126 may border more than one interior recess 128. For example, in FIG.2A, segment 126 x borders interior recess 128 y and 128 z. Accordingly,it will be recognized that each segment 126 may be considered to be apart of multiple cells and, therefore, each segment 126 may beconsidered to a portion of two different reentrant shapes. Because thesegments 126 surround an interior recess 128 in the auxetic structure,the segments 126 may also be referred to herein as “perimeter walls,”“cell walls,” or “interconnected members.” In the embodiment of FIG. 2A,the auxetic structure includes an array of cell units which may beconsidered to exist in rows and columns of the auxetic structure.However, because each interconnected segment 126 may be shared by twodifferent cell units 124, the area covered by the individual rows andcolumns overlaps within the auxetic structure.

In at least one embodiment, the auxetic layer 120 is a unitarystructure, with each cell unit 124 sharing segments 126 with adjacentcell units. The segments 126 are integrally formed such that thematerial forming the segments 126 is continuous and uninterrupted acrossthe auxetic structure. Accordingly, the auxetic structure may be formedusing any of various processes capable for forming segments 126 asintegral members, such as injection molding, three-dimensional printing,die-cutting the auxetic structure from a sheet of material, or any otherappropriate process capable of producing the auxetic structure, examplesof which are discussed in further detail below.

In the embodiment of FIG. 2A-2C, the integrally formed segments 126 aregenerally uniform in width (i.e., the distance across the segmentparallel to the base layer 122), but are staggered in height. Forexample, as shown in FIG. 2A, each segment 126 has a width, w, which isgenerally uniform. In at least one embodiment, this width w is between 1mm and 5 mm, and particularly about 2 mm.

As shown in FIG. 2B, each segment 126 has a height, h, defined betweenthe top surface 127 and the bottom surface 125 of the segment 126.However, this height, h, is staggered across the auxetic layer 120 suchthat the height varies between different segments 126 and at differentlocations across each segment 126. In FIG. 2B, h₁ defines a height ofthe segments 126 forming the reflex interior angle (e.g., the reflexinterior angle in cell unit 124 a is at the intersection of segments 126c and 126 d). Also, h₂ defines a height of the segments 126 at the firstvertex (e.g., vertex 127 a in cell unit 124 a). Because h₁ is greaterthan h₂, it can be seen that the segments 126 are staggered in heightacross the auxetic layer 120. In at least one embodiment, h₁ is between1 mm and 4 mm, and particularly about 2 mm. In this embodiment, h₂ isbetween 0.5 mm and 3 mm, and particularly about 1 mm. As shown in FIG.2B, this staggered height difference between the segments 126 results instep features on the surface of the auxetic structure. In the embodimentof FIGS. 2A-2C, these step features are particularly shown where thefirst vertex of one cell unit 124 abuts the reflex interior angle ofanother cell unit 124.

In addition to height variations between different segments 126, eachindividual segment may also vary in height. For example, as shown inFIG. 2C, a single segment 126 may be tapered in height moving in alongitudinal direction along the segment. As shown in FIG. 2C, segment126 f has a height, h₃, at one end (e.g., near the second vertex) and aheight, h₂, at the opposite end (e.g., near the first vertex). In atleast one embodiment, h₃ is between 2 mm and 5 mm, and particularlyabout 3 mm. In this embodiment, h₂ is between 1 mm and 4 mm, andparticularly about 2 mm. It will be recognized that the varying heightof the segments results in some variations between cell units. Forexample, for segment 126 f in FIGS. 2A and 2C, it will be noted that theportion of the segment having a height of h₃ forms a portion of thefirst apex for the cell unit in the row of arrowhead shapes pointing tothe right in FIG. 2A (i.e., h₃ is at the leading edge of the arrowheadfor the row of shapes pointing to the right). However, this same portionhaving a height of h₃ forms a portion of the second apex for the cellunit in the row of arrowhead shapes pointing to the left in FIG. 2A(i.e., h₃ is at the trailing edge of the arrowhead for the row of shapespointing to the left). Thus it will be recognized that the cell units inthe array have a slightly different structure from row to row of thearray, with the leading edge of the arrowhead the highest point of thecell for all cell units pointing to the right, and the trailing edge ofthe arrowhead the highest point of the cell unit for all cell unitspointing to the left.

The interconnected segments 126 of the auxetic layer 120 are formed froma wall material, which may be provided by any of various materialssuitable for the desired purposes of the auxetic layer. In at least oneembodiment, the wall material forming the interconnected segments 126 isprovided by a resilient polymer material such as ethylene-vinyl acetate(EVA), a thermoplastic such as nylon, or a thermoplastic elastomer suchas polyurethane. Each of these materials possesses elastomeric qualitiesof softness and flexibility. In another exemplary embodiment, thesegments 126 are comprised of foam, such as a thermoplastic polyurethane(TPU) foam or an EVA foam, each of which is resilient and provides acushioning effect when compressed. While EVA and TPU foam are disclosedherein as exemplary embodiments of the auxetic layer 120, it will berecognized by those of ordinary skill in the art that the auxetic layer120 may alternatively be comprised of any of various other materials.For example, in other alternative embodiments, the auxetic layer may becomprised of polypropylene, polyethylene, XRD foam (e.g., the foammanufactured by the Rogers Corporation under the name PORON®), or any ofvarious other polymer materials exhibiting sufficient flexibility andelastomeric qualities.

As noted previously, the segments 126 of the auxetic layer 120 may beformed in any of various methods. By way of example, the auxetic layer120 is formed via a molding process such as compression molding orinjection molding. By way of further example, the auxetic layer isformed via an additive manufacturing process such as selective lasersintering (SLS). In SLS, lasers (e.g., CO₂ lasers) fuse successivelayers of powdered material to form a three dimensional structure. Asyet another example, the auxetic layer 120 may be formed using athree-dimensional printing process.

The bottom surface 125 of the auxetic layer 120 is connected to the baselayer 122, while the top surface 127 remains exposed on the auxeticpanel 118. The auxetic layer 120 may be connected to the base layer 122using any of various connection methods, including printing, fusing,heat transfer, adhesives, or any of various other connection methods aswill be recognized by those of ordinary skill in the art. In at leastone embodiment, the auxetic layer 120 is printed directly on to the baselayer 122 using a three-dimensional printing process. Alternatively, theauxetic layer 120 may first be provided on a transfer sheet, and then aheat transfer method may be used to transfer the auxetic layer to thebase layer 122.

In the exemplary embodiment of FIGS. 1A-2C, the interior recess 128 ofeach cell unit 124 in the auxetic layer 120 exposes the base layer 122through the auxetic layer. However, in at least one embodiment, some ofthe interior recesses 128 in various regions of the auxetic panel 118may be completely or partially filled with a recess material thatpartially or substantially fills the interior recess 128 at the interiorportion of the cell between the perimeter walls (i.e., the segments126). In the embodiments described below with reference to FIGS. 5-9,the recess material is the same material used to form the segments 126of the auxetic layer 120. Filling the interior recess 128 with the samematerial as the segments 126 results in lockout regions where theexpansive characteristics of the auxetic panel 118 are removed in theseregions. However, in at least one embodiment, the recess materialdiffers from the wall material forming the segments 126 of the auxeticlayer. For example, the recess material may be a relatively resilientelastic material (e.g., a hot melt or other thermoplastic material).Filling the void with elastic material generally increases theresiliency of the auxetic structure but reduces the expansivecharacteristics typically associated with auxetic structures. Incontrast, an internal recess 128 void of recess material results in amore expansive auxetic structure (compared to a filled interior recess).

As noted previously, the auxetic layer 120 is connected to the baselayer 122. By way of example, the auxetic layer 120 may be an elastomersheet bonded or otherwise directly connected to a stretch fabric baselayer 122 such that the two layers 120 and 122 function as a unitarystructure. To this end, the auxetic layer 120 may be connected to thebase layer 22 via adhesives, molding, welding, sintering, stitching orany of various other means. In an embodiment, the auxetic layer 120 isbrought into contact with the base layer 122 and then heat is applied toplace the material forming the auxetic layer in a semi-liquid (partiallymelted) state such that material of the auxetic layer in contact withthe base layer infiltrates the base layer fabric. Alternatively, theauxetic layer is applied in a molten or semi-molten state. In eitherapplication, once cooled, the auxetic layer 120 is securely fixed(permanently connected) to the fibers of the base layer 122 such thatany movement of the base layer is transferred to the auxetic layer, andvice versa.

The structure of the auxetic panel 118, including the auxetic layer 120and the base layer 122 provides improved contouring properties around athree-dimensional object compared to a structure including only the baselayer. For example, when incorporated into an article of footwear 10,the vamp easily and smoothly conforms to the various shapes andcurvatures present on the foot. The auxetic panel 118 is capable ofdouble curvature forming synclastic and/or anticlastic forms whenstretched. Double curvatures are prevalent along the length of the humanfoot. Accordingly, the auxetic panel 118 providing the vamp 116 willfollow the curvatures of the foot with little to no wrinkling or foldingvisible to the wearer. Furthermore, the inherent features andcharacteristics of the auxetic panel 118 allow the vamp 136 to beprovided as a single panel that extends across a wide region of thearticle of footwear 10.

While FIGS. 1A shows one embodiment of an auxetic panel 118 that may beused on the article of footwear 10, it will be recognized that theauxetic panel 118 may take a number of different forms. For example, inlieu of the auxetic layer 120 of FIGS. 2A-2C wherein the reentrantshapes are provided in the form of arrowhead shapes, the auxeticstructure of FIGS. 3A-3C may be used, wherein the reentrant shapes arehourglass or bow-tie shapes (which may also be referred to as “auxetichexagons”). Although the shapes formed by the interconnected segments126 are different in FIG. 3A from the shapes formed in FIG. 2A, it willbe recognized that both embodiments share a number of similarities. Forexample, the auxetic panel 118 in FIGS. 3A-3C also includes an auxeticlayer 120 and a base layer 122. The auxetic layer 120 includes aplurality of interconnected segments 126 that form cells units 124oriented in an array, each cell unit being positioned in horizontal rowsand vertical columns. The interconnected segments 126 may have differentwidths, as noted by widths “w” and “x”. An interior recess 128 is formedwithin each cell unit 124, with the interior recess 128 bordered by thesurrounding interconnected segments 126. The width “y” across on of theinterior recesses 128 is generally greater than the width “w” or “x”across one of the interconnected segments 126.

FIG. 4A shows the auxetic layer 120 of FIG. 3A separated from the baselayer 122 and in its normal, unstretched state. The thickness (or width)of the auxetic layer 120 in the unstretched state is indicated as d1.FIG. 4B shows the auxetic layer 120 stretched in the direction of arrows12. The thickness of the auxetic layer in the stretched state isindicated by d2. As can be seen in FIG. 4B, when tension is appliedalong a first direction (indicated by arrows 12), the auxetic structureis stretched, expanding (i.e., becoming thicker) in a second direction(indicated by arrows 13) that is perpendicular to the first directionsuch that in the stretched state d2>d1. This is the result of thepivoting/rotation that occurs along the vertices of the reentrant shape(i.e., where the ends of the interconnected segments form corners of thepolygons in the reentrant shape). It will be appreciated that theauxetic layer 120 of FIG. 2A is also configured to expand in a similarmanner to the auxetic layer of FIG. 4A.

The term “auxetic structure” as used herein generally refers to astructure provided in a configuration that, depending on anappropriately flexible material being used, will have a near zero ornegative Poisson's ratio. In other words, when stretched, auxeticstructures tend to become thicker (as opposed to thinner) or expand in adirection perpendicular to the applied force, or at least do notcontract to a significant extent in a direction perpendicular to theapplied force. This generally occurs due to inherent hinge-likecomponents between the interconnected segments which flex whenstretched. In contrast, materials with a positive Poisson's ratio thatis not near zero contract to a significant extent in a directionperpendicular to the applied outward force (i.e., perpendicular to thedirection of stretch). As used herein, an auxetic structure havingexhibiting a “near zero” Poisson's ratio is a structure exhibiting aPoisson's ratio of approximately zero and, in particular, less than+0.15.

The term “auxetic” as used herein is not limited to structures thatactually have a near zero or negative Poisson's ratio in operation. Thereason for this is that an entire auxetic structure, or portionsthereof, may be practically locked in place and substantially prohibitedfrom expansion or contraction in either direction. For example, astructure comprised of glass may still be considered an “auxeticstructure” if it is provided with the appropriate array of reentrantshapes, although forces attempting to stretch the structure willtypically result in the structure breaking rather than expanding. Also,components or materials adjacent to, within, or surrounding the auxeticstructure may prevent the auxetic structure from exhibiting a near zeroor negative Poisson's ratio when stretched. An example of an auxeticstructure including regions that do not exhibit a zero or negativePoisson's ratio when stretched is described in further detail below withreference to the lockout region of the article of footwear.

In addition to the foregoing, it will be recognized that whether astructure has a negative Poisson's ratio, may depend upon the degree towhich the structure is stretched. Structures may exhibit a negativePoisson's ratio up to a certain stretch threshold, but when stretchedpast the threshold may have a positive Poisson's ratio. For example, itis possible that when the auxetic layer 120 in FIG. 4A is stretched inthe direction of arrows 12 past a threshold expansion position (e.g.,past the state shown in FIG. 4B), the cells and segments of the auxeticstructure may be stretched to an extent that the auxetic structurebecomes slightly thinner (in the direction perpendicular to arrows 12)before the structure is torn apart or otherwise damaged.

In the embodiments disclosed herein, auxetic structures are formed froma plurality of interconnected segments 126 forming an array of cellunits 124, and each cell unit has a “reentrant shape”. As used herein,the term “reentrant shape” may also be used to refer to a “concave”, or“non-convex” polygon or shape, which provides shape having an interiorangle with a measure that is greater than 180°. The angle a shown ineach of FIGS. 2A and 3A is an angle in a reentrant shape having ameasurement of greater than 180°. The auxetic layers 120 in FIGS. 2A and3A are two examples of such an auxetic structure defining a reentrantshape. It will be appreciated that numerous other auxetic structuresdefining reentrant shapes are possible.

With reference now to the embodiment of FIG. 5-7B, the article offootwear 10 is a shoe that includes an upper 100 made from an auxeticpanel 118 including dynamic regions 150 as well as lockout regions 160.The article of footwear 10 is generally similar to the embodimentdescribed above with reference to FIG. 1A and includes an upper 100 anda sole assembly 105 including a midsole 106 and an outsole 108. Theauxetic panel 118 includes an auxetic layer 120 and a base layer 122.The auxetic layer 120 includes an auxetic structure provided by aplurality of interconnected segments 126 forming an array of cell units124. Each of the interconnected segments 126 forms a portion of the cellwalls for at least one cell unit 124. An interior recesses 128 isdefined within the cell walls of each cell unit 124. In the dynamicregions 150 of the auxetic panel 118, the interior recesses 128 of thecell units 124 are void of material and expose the base layer 122. Inthe lockout regions 160 of the auxetic panel 118, fill 162 is providedin the interior recesses 128 of the cell units 124 which covers the baselayer 122.

With particular reference now to FIGS. 5 and 6, the auxetic panel 118extends from a forefoot region 110A to a heel region 110C of the articleof footwear 10. Most of the upper 100 is defines a dynamic region 150 ofthe auxetic panel 118. The lockout regions 160 cover more minor portionsof the upper 100. These lockout regions 160 are illustrated in FIGS. 5and 6 as those areas of the vamp 136 falling within the dotted lines.For example, the lockout regions in FIGS. 5 and 6 include a throatregion 170 and a hallux region 180.

As shown in FIG. 5, the throat region 170 extends laterally across thevamp 136 in an area between the midfoot region 110B of the shoe 10 andthe forefoot region 110A of the shoe. In particular, the throat regionextends from a lateral edge 172 on the lateral side of the shoe wherethe sole 105 is connected to the upper 100, across the foremost lacemounts 134, and to a medial edge (not shown) on the medial side of theshoe where the sole is connected to the upper 100.

As best shown in FIG. 6, the hallux region 180 extends across an area ofthe vamp 136 that generally covers the big toe (i.e., the hallux) of thewearer. The hallux region 180 extends longitudinally from a center line182 at the distal end of the forefoot region 110A to a second point 184near a center of the forefoot region of the shoe. From the second point184, the hallux region 180 extends in a medial direction to a thirdpoint 186 near the medial side of the shoe where the upper 100 isconnected to the sole 105.

FIGS. 7A-7B show an enlarged view of the auxetic panel 118 in thearticle of footwear 10, showing a portion of the dynamic region 150 anda portion of the lockout region 160. In FIG. 7A, the border between thedynamic region 150 and the lockout region 160 is shown in dotted lines.The dynamic region 150 of the auxetic panel is a region that is similarto that described previously with reference to FIGS. 2A-2C. Inparticular, the dynamic region 150 includes a plurality ofinterconnected members 126 that form an array of cell units 124. Eachcell unit 124 in the dynamic region 150 includes an interior recess 128that is void of fill material and exposes the base layer 122.Accordingly, a user viewing the dynamic region 150 of the auxetic panel118 from the side including the auxetic layer 120 (as shown in FIG. 7A)is able to also view the base layer 122 through the recesses 128 in thecell units. The base layer 122 is shown in cross-hatching in FIG. 7A toillustrate a contrast with the auxetic layer 120, and not to show across-section of any type.

With continued reference to FIGS. 7A and 7B, the lockout region 160 ofthe auxetic panel 118 is substantially the same as the dynamic region150 but further includes a fill 162 in the interior recesses 128.Accordingly, the lockout region 160 also includes a plurality ofinterconnected members 126 that form an array of cell units 124. Eachcell unit 124 defines an interior recess 128. The fill 162 is includedin each interior recess 128, with the fill 162 at least partiallyfilling the interior recess 128. In the disclosed embodiment, asufficient amount of fill 162 is included in each interior recess 128 inthe lockout regions such that the fill 162 covers the base layer 122without extending to the top surface 127 of the interconnected segments126. Because of the fill 162 in the recesses 128, a user viewing thelockout region 160 of the auxetic panel 118 from the side of the auxeticlayer 120 shown in FIG. 7A is unable to see the base layer 122.Accordingly, in the lockout region 160 on the right side of FIG. 7A(i.e., the region to the right of the dotted lines), the base layer 122is not shown and the fill 162 is shown in each interior recess 128.

The material used for the fill 162 may be any of a number of differentmaterials. For example, as discussed previously, the fill 162 may beprovided by a relatively resilient elastic material, such as a hot meltor other thermoplastic material. Alternatively, in the embodiment shownin FIGS. 7A-7B, the fill 162 is comprised of the same material as thewall material used to form the interconnected segments 126. For example,the fill may be provided by EVA, nylon, polyurethane, polypropylene,polyethylene, or any of various other polymer materials exhibitingsufficient flexibility and elastomeric qualities. In embodiments whereinthe fill 162 is comprised of the same material as the interconnectedsegments 126, the fill 162 may be integrally formed with theinterconnected segments 126. Thus, the fill 162 and the interconnectedsegments 126 in the embodiment of FIGS. 7A-7B are unitary in compositionsuch that the fill 162 and the interconnected segments 126 form aunitary component with no seam or other division existing between thefill 162 and the interconnected segments 126. While the term “fill” isused herein to refer to a material positioned within the interiorrecesses 128 formed by the interconnected segments 126, it will berecognized that the fill 162 simply references a solid material withinthe interconnected segments 126 (i.e., a material other than air orother gas), regardless of whether the solid material completely coversthe base layer 122 or completely fills the recesses 128.

The lockout regions 160 provide areas on the auxetic panel 118 that areless easily deformed than the dynamic regions 150 (i.e., the lockoutregions 160 are less ductile than the dynamic regions 150). Therefore,when a force is applied to the auxetic panel 118, the dynamic regions150 will stretch and deform more readily than the lockout regions 160.Accordingly, the lockout regions 160 are positioned on the auxetic panel118 in locations where additional stability is desired. In theembodiment of FIGS. 5-6, the lockout regions 160 include the throatregion 170 and the hallux region 180. The throat region 170 generallylimits deformation of the vamp 116 in an area associated with themetatarsal zone of the foot, and thus prevents lateral and medialsliding of the foot in the forefoot region 110A and midfoot region 110Bof the foot cavity. Similarly, the hallux region 180 generally preventsdeformation of the vamp 136 in an area associated with the big toe, andthus limits movement of the big toe in the forefoot region of the footcavity and prevents the big toe from poking through the auxetic panel118. While the throat region 170 and the hallux region 180 are twoexamples of lockout regions 160, it will be appreciated that in otherembodiments the lockout regions 160 may include additional or differentregions.

With reference now to FIGS. 8A-9, an alternative embodiment of anauxetic panel 118 configured for use as a vamp panel is shown. As shownin FIG. 8A, the auxetic layer 120 is shown connected to a base layer122. The auxetic layer 120 is similar to the auxetic layer of theembodiments of FIGS. 5-7B and includes cell units 124 with cell walls126 that form an array of reentrant shapes. The auxetic panel 118includes both dynamic regions 150 and lockout regions 160. The lockoutregions 160 include a throat region 170, a hallux region 180, similar tothat described above, as well as a transition region 190.

With particular reference to FIG. 8A, the auxetic panel 118 is shown onthe base layer 122 prior to removal of an exposed region 123 on the baselayer that is cut away from the auxetic panel 118 prior to attachment ofthe auxetic panel 118 to the sole. As shown in FIG. 8A, in thisembodiment, the auxetic structure of the auxetic layer 120 extendsacross a forefoot region 110A and a midfoot region 110B withoutextending to a heel region 110C of the auxetic panel 118. Four foremostlace mounts 134 in the form of oval openings are formed in the auxeticpanel 118, including two foremost oval openings 805A on a medial side ofthe auxetic panel 118, and two foremost oval openings 805B on a lateralside of the auxetic panel 118. These oval openings provide a foremostlocation wherein the lace (not shown) is coupled to the upper 100. Theoval openings may receive the lace itself or another member configuredto retain the lace (e.g., a lace loop or eyelet). A number of opposinglace eyelets 138 are provided to the rearward side of the oval openings.The lace eyelets 138 are provided along the lateral and medial sides ofa tongue opening 131 which is formed as a hole in the base layer 122 ina tongue region of the auxetic panel 118.

A tongue 132 extends across the tongue opening in the tongue region ofthe auxetic panel 118. As shown in both of FIG. 8A and 8B, the tongue132 is connected to the base layer 122 in the tongue opening 131. Thetongue 132 is not a freely moveable tongue but is instead fixedlyconnected to the base layer 122 along the forward, medial, and lateralsides. In FIGS. 8A and 8B, the tongue 132 is also connected to the baselayer 122 on a rear side, but it will be recognized that this side ofthe base layer 122 is eventually removed to provide an opening to thefoot cavity when the auxetic panel 118 is connected to the sole 105 ofthe shoe.

Although the tongue 132 is connected to the base layer 122 on multiplesides, it is comprised of a different material than the base layer 122.In at least one embodiment, the tongue 132 is comprised of a webbingsuch as a mesh material. The tongue 132 is generally breathable but lesselastic than the base layer. Support strips 133 extend in a lateraldirection across the tongue 132 between opposing lateral sides of thetongue opening. The support strips 133 are generally comprised of thesame material as the interconnected segments 126 of the auxetic layer120 and are integrally formed with the opposing lateral sides of thetongue opening 131. The support strips 133 provide additional supportfor the wearer in the midfoot region across the top of the foot.

FIG. 9A illustrates the locations of the dynamic regions 150 and thelockout regions 160 in the auxetic panel 118 of FIGS. 8A and 8B. Thedotted lines in FIG. 9A illustrate the border between the dynamicregions 150 and the lockout regions. The dynamic regions include amedial dynamic region 154 adjacent to the medial side of the tongueopening, a lateral dynamic region 152 adjacent to a lateral side of thetongue opening, and a forefoot dynamic region 156 adjacent to theforward side of the tongue opening and extending through a metatarsalregion of the shoe and into a toe region of the shoe. As notedpreviously, the auxetic panel 118 is the most ductile in these dynamicregions 150 and configured to expand the most in the dynamic regions 150when a force is applied to the auxetic panel 118.

With continued reference to FIG. 9A, the lockout regions 160 include athroat region 170, a hallux region 180, and a transition region 190. Allof the lockout regions 160 in FIG. 9A are interconnected and such thateach lockout region 160 merges into another lockout region 160 and nosingle lockout region 160 is isolated from the other lockout regions.The throat region 170 generally includes a lateral side that includestwo lateral arms 171, each lateral arm extending from a lateral edge 172of the auxetic panel 118 to a position past (i.e., more central from)the oval openings 136 a and 136 b. The two lateral arms 171 areconnected near midpoint of each arm. The throat region 170 also includesa medial side that includes two medial arms 173, each medial armextending from a medial edge 174 of the auxetic panel 118 to a positionpast (i.e., more central from) the oval openings 805A and 805B. The twomedial arms 173 are also connected near midpoint of each arm.

The hallux region 180 is positioned in the forefoot region of the shoe,and particularly in a toe region. The hallux region 180 is configured tocover the big toe of the wearer when the auxetic panel 118 is connectedto a sole and the foot of a wearer is inserted into the foot cavity. Thehallux region 180 generally extends from the medial side of the auxeticpanel 118 to an approximate center line 182 of the auxetic panel, andfrom the foremost end of the auxetic panel 118 to a position near themetatarsal region of the auxetic panel 118. The hallux region 180 isconnected to the foremost of the two medial arms 173 in the proximity ofthe metatarsal region.

The transition region 190 extends along the perimeter of the auxeticpanel 118. The transition region 190 generally extends along the entirelength of the perimeter from the lateral side, through the forefootregion, and to the medial side. As shown in FIG. 9A, the transitionregion is briefly interrupted at several locations along the perimeterby small dynamic region fingers 158 that extend inwardly on the auxeticpanel 118 from the perimeter.

The transition region 190 includes a taper zone 192 and a flat zone 194.The taper zone 192 is positioned to the inward side of the flat zone194, and the flat zone 194 is positioned on the outermost perimeter ofthe transition region 190. In the taper zone 192, the height of theinterconnected segments 126 of the auxetic panel gradually taper from afull height, h_(x) to a fill height, h_(o). Heights h_(x) and h_(o) arerepresented in FIG. 9A along cross-sections B-B and C-C, respectivelyshown in FIG. 9B and FIG. 9C. In each of FIGS. 9A and 9B, height h_(x)represents the full height of the interconnected segments 126, which maybe any of the various heights of the interconnected segments 126 atvarious locations on the auxetic panel 118, as discussed previously withreference to FIGS. 2B and 2B. Height h_(o) represents a height of theinterconnected segments 126 that is equivalent to the height of the fill162. Because the height of the interconnected segments 126 taper fromh_(x) to h_(o) in the taper zone 192, the auxetic structure generallyfades from fully visible auxetic cells to a flat surface in the taperzone 192. In the flat zone 194, the auxetic layer 120 provides agenerally smooth, flat surface. In this flat zone 194, the height of theinterconnected segments 126, h_(o), may be considered to be the same asthe height of the fill. As a result, a generally flat and smooth surfaceresults in the flat zone. In the embodiment of FIGS. 8A-9C, the recessmaterial is the same as the wall material such that the flat zone 194 isintegral and provides a smooth continuous surface. Advantageously,because the outer perimeter of the auxetic layer 120 is where the upper100 is connected to the sole 105, the flat zone 194 of the transitionregion 190 provides a consistent surface to receive adhesive as well asallow for stitching of the auxetic panel 118 to the sole.

While the invention has been described in detail and with reference tospecific embodiments thereof, it will be apparent to one skilled in theart that various changes and modifications can be made therein withoutdeparting from the spirit and scope thereof. For example, while theembodiments disclosed herein show an article of apparel in the form ofan article of footwear, and particularly a shoe, it will be recognizedthat the term “article of apparel” as used herein refers to any garment,article of footwear or accessory configured to be worn on or carried bya person (whether human or otherwise). Examples of articles of apparelinclude helmets, hats, caps, shirts, pants, shorts, sleeves, knee pads,elbow pads, shoes, boots, backpacks, duffel bags, cinch sacks, andstraps, as well as numerous other products configured to be worn orcarried by a person. Examples of other articles of footwear includesocks, boots, cleats, or any of numerous other products configured to beworn in association with the foot of a person.

While the figures disclosed herein reference various regions of thearticle of footwear 10, including the forefoot region 110A, midfootregion 110B, and heel region 110C, it will be recognized that each ofthese regions generally corresponds to a region of a human footassociated with such region in the article of footwear 10. Furthermore,it will be recognized that overlap may occur between regions or that atransition region may be defined between each of these regions.Accordingly, when various portions of the upper 100 or sole assembly 105are described herein as extending to different “regions”, it will berecognized that these regions may be generally defined with reference toa human foot positioned within the associated article of footwear.

The components of the upper 100 may be presented in any of variousconfigurations and thereby provide different forms of the footwear. Forexample, the upper 100 may be configured as a low-cut running shoe, ahigh-top basketball shoe, or any of various other forms of athleticshoes. The upper 100 may also be configured with various tighteningmechanisms to secure the article of footwear 10 to the foot of thewearer. For example, the upper 100 may be configured such that thearticle of footwear is a lace-up shoe, a slip-on shoe, or astrap-tightened boot.

The foregoing detailed description of one or more exemplary embodimentsof the articles of apparel including auxetic materials has beenpresented herein by way of example only and not limitation. It will berecognized that there are advantages to certain individual features andfunctions described herein that may be obtained without incorporatingother features and functions described herein. Moreover, it will berecognized that various alternatives, modifications, variations, orimprovements of the above-disclosed exemplary embodiments and otherfeatures and functions, or alternatives thereof, may be desirablycombined into many other different embodiments, systems or applications.Presently unforeseen or unanticipated alternatives, modifications,variations, or improvements therein may be subsequently made by thoseskilled in the art which are also intended to be encompassed by theappended claims. Therefore, the spirit and scope of any appended claimsshould not be limited to the description of the exemplary embodimentscontained herein.

What is claimed is:
 1. An article of apparel comprising: a base layer;and an auxetic layer coupled to the base layer, the auxetic layercomprising an auxetic structure defining a repeating pattern ofperimeter walls and interior recesses, the auxetic layer including afirst region and a second region, wherein each interior recess in thefirst region provides a void exposing the base layer, and wherein eachinterior recess in the second region is at least partially filled with arecess material.
 2. The article of apparel of claim 1 wherein the baselayer is a four way stretch material.
 3. The article of apparel of claim1 wherein the recess material is unitary in composition with theperimeter walls.
 4. The article of apparel of claim 1 wherein thearticle of apparel is an article of footwear.
 5. The article of apparelof claim 1 wherein the perimeter walls include a top surface and anopposite bottom surface, wherein the bottom surface faces the baselayer, and wherein the recess material covers the base layer in eachinterior recess of the second region without extending to the topsurface of the perimeter walls.
 6. The article of apparel of claim 1wherein the perimeter walls of the auxetic structure comprise aplurality of interconnected wall segments that form a repeating patternof reentrant polygonal shapes.
 7. The article of apparel of claim 1wherein the auxetic structure has a Poisson's ratio of substantiallyzero or less than zero.
 8. An article of apparel comprising: a baselayer; and an auxetic structure coupled to the base layer, the auxeticstructure including a plurality of interconnected members forming anarray of cell units, each of the plurality of interconnected membersforming cell walls with interior recesses defined within the cell walls,the array of cell units including at least one dynamic region whereinthe interior recesses expose the base layer and at least one lockoutregion wherein a fill in the interior recesses covers the base layer. 9.The article of apparel of claim 8 wherein the base layer is a four waystretch material.
 10. The article of apparel of claim 8 wherein the fillis unitary in composition with the interconnected members.
 11. Thearticle of apparel of claim 8 wherein the article of apparel is anarticle of footwear.
 12. The article of apparel of claim 8 wherein theinterconnected members include a top surface and an opposite bottomsurface, wherein the bottom surface faces the base layer, and whereinthe fill covers the base layer in each interior recess of the lockoutregion without extending to the top surface of the cell walls.
 13. Thearticle of apparel of claim 8 wherein the interconnected members of theauxetic structure comprise a plurality of wall segments that form arepeating pattern of reentrant polygonal shapes.
 14. The article ofapparel of claim 8 wherein the auxetic structure has a Poisson's ratioof substantially zero or less than zero.
 15. An article of footwearcomprising: a sole; and an upper connected to the sole, the upperincluding a base layer; and an auxetic layer connected to the baselayer, the auxetic layer comprising an auxetic structure defining arepeating pattern of shapes, each of the shapes defined by perimeterwalls with an interior recess provided within each shape, the auxeticlayer including a first region and a second region, wherein eachinterior recess in the first region provides a void exposing the baselayer, and wherein each interior recess in the second region is at leastpartially filled with a recess material.
 16. The article of footwear ofclaim 15 wherein the perimeter walls define a top surface and anopposite bottom surface, wherein the bottom surface faces the baselayer, and wherein the recess material covers the base layer in eachinterior recess without extending to the top surface of the perimeterwalls in the second region.
 17. The article of footwear of claim 15wherein the perimeter walls are comprised of a wall material, whereinthe wall material is integrally formed with the recess material in thesecond region.
 18. The article of footwear of claim 15, the secondregion is provided in a toe region and a transition region of the upperextending along the perimeter of the sole.
 19. The article of footwearof claim 15 wherein the repeating pattern of shapes is a repeatingpattern of polygonal reentrant shapes and the auxetic structure has aPoisson's ratio of substantially zero or less than zero.
 20. The articleof footwear of claim 15 wherein the base layer comprises a four waystretch material.